Maybe my understanding isn't clear, but what means "having variation within a cluster? It means that, for example, in cluster 3, all answers to A193 should be the same for all my respondants in Cluster 3?

Thanks. I tried and the error was gone. One thing i don't understand now. How can i test a level 2 variable impact on a level 1 variable. Exemple, Supervisor Support at Group Level impact on Satisfaction at individual level. I seem to be able to test on one level, Mplus ask me to chose one or another? If you look this syntax, i want to test Lmxb on HUMSUPN.